This is a mod that adds 4 new music discs to the game: "minimal," "depado," "krank," and "phlips," all of which were produced by C418 and released under CC-By 3.0 licenses. "minimal" and "depado" come from C418's album circle, and "krank" and "phlips" come from zweitonegoismus.
This mod requires Mineclone 2, more specifically mcl_jukebox, to run. It will likely also work with Mineclone 5, but this hasn't been tested.
Beautiful music
There is just something magical about this particular style of music. This music is nice to listen to even if you're not playing.